diff --git a/README.md b/README.md
index 8cc43e6a7bdca9752aa03f78aa5c1ee135fccdb8..102f2013647e05b73bce7a9e445b8d488b3901a0 100644
--- a/README.md
+++ b/README.md
@@ -218,3 +218,10 @@ Compiling CbmRoot with multicore support using "make -j", without
 specifying the number of threads, is known to cause MacOS and Ubuntu
 20.04 LTS systems to freeze. Please explicitly choose a number of cores
 which is suitable for your system.
+
+# 6. Code formatting
+
+Please format your code with "git clang-format" command, otherwise it will not be merged.
+The valid version of the clang-format tool and the installation instructions can be found here:
+
+https://redmine.cbm.gsi.de/projects/cbmroot/wiki/Clang-format